爱上一个人只需一秒钟忘却一个人却要一辈子
[ài shàng yī gè rén zhĭ xū yī miăo zhōng wàng què yī gè rén què yào yī bèi zi]
Falling in love takes only one second, but forgetting someone can take a lifetime. It contrasts the immediate impact of falling in love versus the long and difficult process of forgetting or moving on from someone.